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Redeemable Non-Controlling Interests (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Redeemable Noncontrolling Interest [Roll Forward]        
Balance, beginning balance     $ 671.5  
Decrease attributable to consolidated Affiliate sponsored investment products     (14.4)  
Transfers to Other liabilities     (83.0)  
Transfers from Non-controlling interests $ 3.3 $ 0.3 3.8 $ 5.4
Changes in redemption value 72.2 $ 110.9 177.8 $ (32.1)
Balance, ending balance 755.7   $ 755.7  
Minimum        
Noncontrolling Interest [Line Items]        
Term of conditional right to put interest     5 years  
Maximum        
Noncontrolling Interest [Line Items]        
Term of conditional right to put interest     15 years  
Variable Interest Entity, Primary Beneficiary        
Redeemable Noncontrolling Interest [Roll Forward]        
Balance, beginning balance     $ 35.4  
Balance, ending balance $ 21.0   $ 21.0